Tool-holder.



No. 653,754. Patented, July I7 1900.

J. M. NURMAND.

TOOL HOLDER.

(Application filed Nov. 11, 1899.)

(No Model.)

wucwtoz 771. mmat.

UNITED STATES PATENT OFFICE.

JOSEPH M. NORMAND, OF SPRINGFIELD, OHIO, ASSIGNOR OF ONE-HALF TO GEORGE W. REIOHARD, OF SAME PLACE.

TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 653,754, dated July 17, 1900.

Application filed November 11, 1899. Serial No. 736,612. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH M. NORMAND,

a citizen of the United States, residing at No.

87 South Factory street, Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Tool-Holders, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in tool-holders for use in connection with lathes and other suitable iron-working tools.

The general objects of my invention are, first, to provide a V-shaped groove in the forward end of the tool-holder proper, in which groove is formed a succession of teeth or serrations for engaging the teeth of a cuttingtool adapted to fit therein second, to provide a construction whereby the cutting-tool is gripped evenly throughout the entire portion in contact with the tool-holder, and, third, to so construct the head of the clamping-to0l that it will occupy the least possible space along a horizontal line, whereby the toolholder may be inserted within a post and be gripped therein closer to the cutting-tool.

This invention also relates to details of construction and arrangement hereinafter appearing and particularly pointed out in the claims.

In the accompanying drawings, on which like reference-letters indicate corresponding parts, Figure 1 is a side elevation of my improved cutting-tool holder and also showing a cutting-tool therein; Fig. 2, a plan view of the same; Fig. 3, a side elevation of the toolholder proper, and Fig. 4 a detail view of a clamping-plate.

I am aware that it is not new to provide a V-shaped groove in a clamping-plate, which groove has serrations therein; but such construction has not proved as practical as the construction illustratedin the drawings filed herein, for the reason that the cutting strains are brought directly upon the clip instead of the holder proper, as they should be. I am also aware that it is old to provide a clamp for binding a cutting-tool between a toolholder proper and said clamp; but so far as I am aware none have provided for distributing an even pressure uponthe cutting-tool where it comes in contact with the holder, and this I accomplish in a novel and practical manner, as will shortly appear.

The letter A represents a tool-holder proper having its forward edge beveled upward and outward, as shown at B. It will be observed that the upper edge of the tool-holder proper has'an extension 0 projecting upward therefrom. In this extension is formed a screwhole, as shown at D, for the reception of a setscrew E. Beneath this screw-hole and forward of it is formed another hole F, through which extends a binding-screw G, such latter screw being adapted to engage with a clip H, shaped to conform to the forward end of the holder proper, as particularly illustrated in Fig. 4. This screw G is adapted to screw into this clip to draw it toward the holder proper. 7o

It will be observed that along the forward edge of the holder proper is formed a V- shaped groove 1, having serrations J therein. (See particularly Fig. 3.) The cutting-tool, which is preferably square or diamondshaped, such as illustrated at K, is adapted to fit within the V-shaped groove I and carriers serrations L along one of'its edges to engage with the serrations J in the tool-holder proper. It will be observed from Fig. 2 that the clamp H is also grooved at M and fits over the cutting-tool K, so that the groove in the clamp and the groove in the tool-holder proper form a channel for the reception of such cutter. Asthebinding-screwGisturned up against the tool-holder-proper, it binds the clip H against the tool K.

It will be observed that the upper end of the clip H is adapted to be pressed upon by the set-screw E. This will cause the clamping-plate to pinch down hard upon the cutting-tool, so that all chatter is done away with. By reason of the location of the setscrew E and the locking-screw G with respect to the forward beveled edge of the tool-holder proper binding action on the tool-holder between the holder and the clamping-plate is through a central axis passing lengthwise of the cutting-tool. Thusinstead of one cor ner, as it were, of the clamping-plate grip- 10o ping the cutting-tool much harder than at other points where it contacts with the said further overcome such chatter, it will be observed that the forward portion of the toolholder, as also the clamping-plate, which I term the head, is so formed that it may be inserted in the tool-stock or tool-post much closer to the cutting-point than would be the case if the clamping plate and clampingscrew were in a substantially-horizontal line through the main body of the holder proper, so that one of the chief results which I am able to accomplish with my device is due to the location of the set-screw above the main body of the tool-holder. Thus I am not only enabled to insert the tool-holder in the toolpost much closer to the cutting-point, but by my peculiar formation I am enabled to remove the set-screw at a greater distance from the binding-screw than the clamping edge is from such screw, so that I greatly increase the power which may be applied throughout the contact portion of the cutting-tool with the holder.

It will be observed that the clamping-plate H fits within an offset N in the tool-holder proper. This offset prevents the clampingplate from turning around out of place when the clamping-screw F is loosened. Such construction makes a neater and more attractive tool-holder, aside from the practical advantage of holding the clamping-plate in position.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a tool-holder, the combination with a holder proper having a raised portion near its forward end and having its forward edge beveled upward and outward and also having a serrated V-shaped groove adjacent to said forward beveled edge, of a clamping-plate having a V-shaped groove therein to match the groove in said holder proper and also having its inner end substantially conforming to the shape of said raised portion, a bindingscrew for binding the clamping-plate to said holder proper and a set-screw adapted to screw through said binding-plate against said raised portion, substantially as shown and described.

2. In a tool-holder, the combination with a holder proper with its forward edge beveled upward and outward and having a serrated groove therein adjacent to its forward edge,

a cutting-tool serrated along one edge and adapted to fit within said groove and match said serrations, a binding-plate having a groove therein and adapted to fit over said cutting-tool and extend therefrom in substantially a right angle, a binding-screw and a set-screw in a line also substantially at right angles to said on tting-tool, said binding-screw to bind the holder proper and clamp upon the cutting-tool and said set-screw acting to additionally cause said clamping-plate to impinge upon said cutting-tool, substantially as shown and described.

3. In a tool-holder, the combination with a holder proper with its forward edge beveled upward and outward and having a raised portion near its forward upper edge, said holder proper having a groove adjacent to said forward edge and parallel thereto, a clampingplate adapted to conform to the shape of said forward edge of the holder proper and also having a groove therein parallel to its forward ed ge,a clamping-screw for clamping said parts together, and a set-screw adapted to screw into said holder proper through said raised portion and impinge against said clamping-plate, and a cutting-tool adapted to fit in said grooves and to be clamped therein, substantially as shown and described.

4. In a toolholder, the combination with a holder proper having a straight continuous lower edge and having a raised portion near its forward upper edge, and also having an offset near its forward end in one side thereof, said offset being substantially V-shaped, the rear wall of said offset sloping downward and forward, the thinned portion (resulting from the provision of the V-shaped ofiset) having a V-shaped groove therein extending downward and rearward, a clamping-plate having a V-shaped groove therein matching the groove in said holder proper, said clamping-plate fitting within said ofiset and matching said raised portion, a clamping-screw adapted to extend through said holder proper and into said clamping-plate, a cutting-tool fitting within said grooves and substantially embraced by said clamping-plate and holder proper, all substantially as shown and described.

In testimony whereof I afiix my signature in presence of two witnesses.

JOSEPH M. NORMAND.

Witnesses:

B. B. ESTERLINE, W. M. MCNAIR. 

